采用宏、微观、扫描电镜、化学分析、应力测定及计算等方法对断裂螺母进行了分析。
The fracture analysis was made by means of microstructure, macrostructure, SEM, chemical composition, stress measurement and calculation.
根据断口的宏、微观形貌，认为油管焊接后未及时消除焊接应力，产生了淬硬裂纹；
The macro and micro analysis of fracture indicates that it produces fracture because it doesn′t avoid welding stress in time.
基于俞茂宏统一强度理论，研究了砂土在复杂应力状态下的动强度及其指标确定的新方法。
A new method was proposed to determine the dynamic shear stress and dynamic strength index of soil under the complex stress, based on the Yu Maohong's unified strength theory.
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